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Diagnostic Study of Water Quality in the Lower Mekong Basin

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Diagnostic Study of Water Quality in the Lower Mekong Basin ISSN: 1683-1489 Mekong River Commission Diagnostic study of water quality in the Lower Mekong Basin MRC Technical Paper No. 15 March 2007 Meeting the Needs, Keeping the Balance Mekong River Commission Diagnostic study of water quality in the Lower Mekong Basin MRC Technical Paper No. 15 March 2007 Published in Vientiane, Lao PDR in March 2007 by the Mekong River Commission Cite this document as: MRC (2007) Diagnostic study of water quality in the Lower Mekong Basin. MRC Technical Paper No. 15, Mekong River Commission, Vientiane. 57pp. The opinions and interpretation expressed within are those of the authors and do not necessarily reflect the views of the Mekong River Commission. Editors: Dr. Edwin Ongley, Dr. Martine Allard and Dr. Tim Burnhill Series Editor: Dr. Tim Burnhill © Mekong River Commission 184 Fa Ngoum Road, Unit 18, Ban Sithane Neua, Sikhottabong District, Vientiane 01000, Lao PDR Telephone: (856-21) 263 263 Facsimile: (856-21) 263 264 E-mail: [email protected] Website: www.mrcmekong.org ii Table of Contents Summary ix 1. Introduction 1 The Mekong River basin 1 Potential sources of pollution 2 Upper Mekong Basin 2 Lower Mekong Basin 3 MRC water-quality monitoring programme 5 Water-quality and MRC’s Water Utilisation Programme 7 Diagnostic study framework 7 Main activities 7 Study concept and limitations 8 2. Definition of Priority Topics and Areas 9 Methodology 9 Results 13 3. Assessment of MRC Water-quality Database 15 Methodology 15 Transported loadings 15 Water-quality assessment 16 Results and discussion 18 Chemical loads 18 Water-quality assessment 19 MRC water-quality database limitations 21 4. 2003 and 2004 Field Campaigns 23 Sampling sites 23 Sampling programme 24 Selection of matrices, analyses and sample collection 24 2003 field campaign 25 2004 field campaign 25 Analytical methodology 28 Laboratories 28 Sample transportation 28 Sampling and analytical methodologies 28 Data treatment and processing 30 5. Results and Discussion 35 Water 35 Major ions 35 Salt contamination from the Khorat Plateau 36 Nutrients 36 iii Sediments 37 Total heavy metals concentrations in sediments 37 Heavy metal concentrations in sediments and their eco-toxicity potential 38 Dioxins and furans in sediments 43 Other parameters analysed in sediments 44 Bioassays 46 Results from the 1st campaign (2003) 46 Results from the 2nd campaign (2004) 47 6. Conclusions and Recommendations 49 Synthesis 49 Multi-criteria analysis 49 Main recommendations 51 Benchmark sites 51 WQMN programme 51 WUP water-quality modelling and management 53 7. References 55 iv Acknowledgements This study was funded by the French Government as part of its co-financing of the MRC Water Utilisation Programme, and was contracted to the French firm BURGÉAP. BURGÉAP implemented this work in association with CEMAGREF1 and with input from several other European research organizations. The field work was carried out with assistance from the four national laboratories that participate in the water-quality monitoring activities of the MRC. This technical paper is based largely on the final report submitted to the MRC by BURGÉAP and has been edited to meet the style required of MRC publications. In this regard the editors wish to thank Christophe Pateron of BURGÉAP for his assistance. The MRC also wishes to thank the National Mekong Committees of Cambodia, Lao PDR, Thailand and Viet Nam for their cooperation and support as well as the many regional experts who assisted in the conduct of the field campaigns. 1Agriculture & Environmental Research Institute (a French public research centre). v vi Abbreviations and Acronyms AFNOR: Association Française de Normalisation BOD5: Biological Oxygen Demand (5 days) BTEX: Benzene, Toluene, Ethylbenzene and Xylene CN: Cyanide COD: Chemical Oxygen Demand DAIpo: Diatom Assemblage Index to organic water pollution VOCs: Volatile Organic Compounds DO: Dissolved Oxygen GEF: Global Environment Facility IBD: Indice Biologique Diatomées = Biotic Diatom Index IPS: Indice de Polluosensitivité spécifique = Specific polluo-sensitivity index ISQG: Interim Sediment Quality Guideline I-TEQ: International Toxicity Equivalents LMB: Lower Mekong Basin MRC: Mekong River Commission NMCs: National Mekong Committees OCDD: Octadichlorodibenzodioxin OCDF: Octadichlorodibenzofuran PAHs: Polycyclic Aromatic Hydrocarbons PCBs: Polychlorinated Biphenyls PCD: Pollution Control Department PCDDs: Polychlorinateddibenzodioxins PCDFs: Polychlorinated dibenzofurans PEC: Probable Effect Concentration PEL: Probable Effect Level QA/QC: Quality Assessment / Quality Control TEC: Threshold Effect Concentration TEF: Toxicity Equivalent Factor TEL: Threshold Effect Level TSS: Total Suspended Solids USEPA: United States Environmental Protection Agency WQDS: Water Quality Diagnostic Study WQMN: Water Quality Monitoring Network WUP: Water Utilisation Programme vii viii Summary Water-quality monitoring in the Lower Mekong Basin has been carried out at approximately 100 stations (in Lao PDR, Thailand and Viet Nam since 1985, and since 1993 in Cambodia) by national laboratories coordinated by the Mekong River Commission (MRC). This programme uses conventional physico-chemical measurements typical of such programmes world- wide. Because there is little data on environmental contaminants in the Mekong River and its tributaries, the GEF/MRC Water Utilization Programme (WUP) commissioned a major diagnostic study of water quality in the Lower Mekong Basin. The study was carried out in two phases, with field campaigns in 2003 and 2004.Twenty-two sites were sampled in 2003, and, on the basis of results from that year’s survey, 16 sites were selected for sampling in 2004. The field campaigns were undertaken during the dry season in both years. Samples of river water and river-bed sediments were analysed for a wide range of conventional parameters, and for toxic micro-pollutants, including persistent and bio- accumulating organic pollutants such as pesticides, PAHs, PCBs, dioxins and furans. Sediment was included as many of the persistent toxic compounds are known to accumulate in this substrate. Because concentrations of particular chemicals are not explicitly linked to ecological health, a bioassay test was conducted at selected sites in both years to assess presence/absence of toxicity. The data from 2003 demonstrated that the conventional water-quality data collected through the MRC water-quality programme is of satisfactory reliability, therefore these conventional parameters were not analysed in 2004. The study establishes current baseline conditions for environmental contaminants in the lower Mekong River and its major tributaries. Concentrations of metals in water and sediment are mainly below any level of concern. Industrial contaminants and pesticides in water are all less than the detection limit and less than published criteria (where available) for biological effects. The environmental effect of pesticides on sediments cannot be determined as the detection limits available in this study were too high for most pesticides. On analysis, samples from several sites gave a positive toxic response to the bioassay test organism, however measured chemistry was almost always lower than published threshold effects levels. A few sites had levels of some compounds that are higher than other sites (but lower than threshold effects levels) and deserve additional attention, both in terms of defining more precisely the nature and extent of contamination, and to determine if these pose any downstream and/or trans-boundary risk. The stretch of the Mekong River where it leaves China and enters Lao PDR is problematic insofar as toxicity was recorded in both years, however this is not correlated with measured chemistry. KEY WORDS: Mekong; water-quality; toxicity; environmental contaminants; trans-boundary issues. ix Diagnostic study of water quality in the Lower Mekong Basin China Myanmar Viet Nam Lao PDR Thailand N Cambodia 0 300 Km Upper Mekong Basin Lower Mekong Basin Figure 1. The Mekong River Basin 40,000 Kratie 30,000 Se Kong, Se San and Sre Pok Pakse Se Bang Fai, Se Bang Hieng, Se Done, Nam Mun and Nam Chi 20,000 Mukdahan Nam Ngum, Nam Theun and Nam Hinboun Vientiane 10,000 Luang Prabang Nam Ou and Mean monthy discharge (cumecs) discharge Mean monthy Nam Mae Kok Yunnan component 0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Month Figure 2. Mean monthly discharge at selected locations showing the main tributaries in each reach. Arrows indicate from upstream to downstream. The period of record is 1960-2000 (MRC, 2004) 1. Introduction The water resources of the Mekong River provide livelihoods for most of the 60 million people who live in the Lower Mekong Basin. These livelihoods to a large extent depend on the environmental health of the Mekong River and its tributaries remaining in good condition. Water quality is a key determinant of environmental health. The Mekong River Commission has monitored the water quality of most of the river since the mid 1980s (monitoring of the Cambodian stretch of the Mekong only began in 1993). The parameters the MRC monitors are the conventional physico-chemical measures that are employed by similar programmes world- wide. Because there are little data on environmental contaminants in the Mekong River and its tributaries, the MRC Water Utilization Programme (WUP) commissioned a major diagnostic study of water quality in the Lower Mekong Basin. This report documents the results of the study, which included additional data from field sampling campaigns
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